Saint[note 1] Idesbald (Idesbaldus) (c. 1100–1167) was a Cistercian monk and abbot of Ten Duinen Abbey.

In 1150, he became a Cistercian monk at the abbey of Our Lady of the Dunes (Ten Duinen), serving as abbot of this foundation from 1155 to 1167.

In 1577, the Geuzen plundered the abbey, and the monks transported Idesbald's relics to a monastic grange at Bogaerde.

[1] On 13 November 1623 his coffin was opened in the presence of several witnesses so that the relics could be inspected and authenticated; the body was reported to be incorrupt.

It is hypothesised that the coffin and skeleton represent the burial of a later abbot[3] The village of Saint-Idesbald, which gained fame as an artists' quarter, takes its name from him.